Budolph c



(No Model.)

R. C. SMITH 8L W. SCHWANHUSSBR.

STOP MOTION FOR BLEVATORS.

N40. 807,814. Patented Nov. 11, 1884.v fv--` l Stix N. PETKRS, Fholwulhdgnpher. wnminman, D. c.

Nrran STATES ATnNT Trice..

RUDOLPH O. SMITH AND VILLIAM SOHWANHUSSER, OF YONKERS, N. Y.

STOPll/IOTION FOR ELEVATO RS.

SPECIFICATION forming part of Letters Patent No. 307,814, dated November l1, 1884.

Application filed May 10, 1884. (No model.)

' To @ZZ whom, it may concern:

results ensuingin hoisting apparatus from thev temporary arrestingr of the cage while the hoisting-rope continues its downward movement; and this object we effect through the medium of appliances, fully set forth hereinafter, which arrest the driving mechanism upon the driving-rope becoming slack.

In the drawings, Figurel is an inverted plan of sufficient of a hoisting device to illustrate our improvement. Fig. 2 is a side view in part section, and Fig. 3 is a section on the line l 2, Fig. l.

A B O are .parallel shafts of the hoisting mechanism, the driving-shaft A carrying the idler-pulley b and the driving-pulleys a j', to which the direct and cross bands D E are conducted,and upon which they are shifted by the movements of the shifting-bar F.

The shaft O carries the winding-drum G, driven from the shaft A through the intermediate shalt and its gears, as usual.

The cable x from the winding-drum passes over pulleys X to the cage or platform, which is raised or lowered,according as the drum rcvolves in one direction or the other.

An extension, c,on the shaft C is threaded to receive a traveling nut, g, which travels between collars or shoulders s t upon the shaft, and slides in guide-grooves u in a shell or hollow drum, I, having upon the periphery au annular rack, t', which engages with the teeth of a rack, J, upon a longitudinally-sliding bar, K. A second rack, L, upon the bar K gears with a pinion upon the shaft M, turning in bearings upon the frame of the machine, and carrying a pinion, m, which engages with a rack upon the shifting-bar F. The shell I rotates uponv bearings on a bracket, N.

As the drum Gis turned in either direction, the nut gis prevented from turning by contact with the shell I, but can travel freely in one direction or the other until it strikes the shoulder s or t, when the shell will be caused to revolve with the shaft, and the bar K will be moved longitudinally, sliding the bar F and shifting the belts as soon as the cage or platform reaches its upper or lower position. These features are well known and in common use; but we employ them, in connection with the devices which we will now describe, in order to shift the belts, whatever may be the position of the platform, should the hoisting-rope become slack. The opening in the shell I, through which the shalt C passes, permits the ,shaft to play independently of the shell, and

the boxes P, instead of being permanently connected to their supporting-brackets Q, are arranged in slot-s therein, and rest upon springbearings p of such character that so long as there is any draft upon the hoisting-rope the shaft O will be central with the shell I; but the bearings will yield under the weight of the shaft and its drum should the rope become slack.

The collar t is provided with teeth forming a ratchet wheel, P, secured fixedly to the shaft C, and the shell I carries within it a pawl, q, which, so long as the shaft and the shell are concentric, is free from contact with the ratchet-wheel, but when the ratchet moves downward or to one side, as results when the shaft O sinks when the rope becomes slack, the pawl will engage with the ratchet. The contact ofthe ratchet and pawl results in causing the shell torevolve with the shaft and in moving the bars K and F, so as to shift the belts and arrest the movement of the driving mechanism, the shifting of the belt being effected by the motive power of the machine.

A fixed pin may be substituted for the pawl q, and the shaft-bearings may be supported in any suitable manner, so as to move in any direction as soon as the draft upon the hoisting `rope ceases, and any other belt-shifting appliances capable of being thrown into operation upon'the shaft losing its alignment may bev employed, together with connections whereby the belt-shifting devices are positively oper'- ated by the motive power of the machine.

Vithout limiting ourselves to the precise construction and arrangement of parts described, we claiml. The combination, in a hoisting-machine, of a hoisting-drum carried by a shaft capable of a limited movement in or with its bearings IOO and driven by the motive power of the machine, a shifting device, and intermediate appliances, substantially as described, whereby such device is thrown into connection with the driving-shaft when the drum-shaft moves from the position in which it is maintained by the draft of the hoisting-rope, substantially as described.

2. The Combination 0f the driving-drum having its shaft mounted in movable bearings and extending into a shell revolving upon fixed bearings, a belt-shifter, and projections upon the shaft and shell arranged to be brought in Contact when the shaft moves from the position in which it is maintained by the draft upon the hoisting-rope, substantially as specified.

3. The combination of the hoisting-drum carried by the shaft turning in movable bearings having spring-seats, a ratchet, P', on the shaft, a shell, I, turning in fixed bearings and carrying a pawl, and a belt-shifter connected to be operated by the movement of the shell, substantially as described.

In testimony whereof We have signed our names to this specification in the presence of 25 two subscribing Witnesses.

RUDOLPH C. SMITH. WVM. SCHWANHAUSSER.

Vitnesses:

J. M. ALVORD, HIRAM S. VVIGG-INs. 

